It is necessary to set the weapon on top of the helmet by the tranmission control to aviod exposing the head and the eyes outside the bunker, and the helmet itself is a drone too.

It is not a game. It is the simulation by the playing from people. Everything occurring in the real world is scanned into the virtual reality; everything happening in the virtual reality could change the real world too but not must be immediately. It could simulate until making sure everything is ok and there is no any problem then let the drones update the real world in according to the new right virtual reality.